Question

Solve the problem in mathematics ​

Answer 1

Step-by-step explanation:

an=a+(n-1)d

50=5+(n-1)3

50=5+3n-3

50=2+3n

48=3n

n=16

Sn=n/2 [2a+(n-1)d]

=16/2 [2(5)+(16-1)3]

=8[10+45]

=440 ans

Answer 2

KT'S ANSWER

a=5 d=3 an=50 n=? Sn=?

an=a+(n-1)d

50=5+(n-1)3

50-5=(n-1)3

45/3=n-1

15=n-1

15+1=n

n=16

Sn=n/2[2a+(n-1)d]

Sn=16/2[2(5)+(16-1)3]

Sn=8[10+45]

Sn=8(55)

Sn=440

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